Our ancient ancestors may have slept better than you, but less

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Photos:Power napping: Leaders and VIPs dozing off

The pomp! The circumstance! The ... drowsiness? Being rich and powerful can really take it out of you -- and when your days are packed to the gills with a seemingly endless list of official obligations, political summits, and glamorous state dinners with other powerful people, it's tempting to catch a little shut-eye when you can.

Here's an inexhaustive list of foreign dignitaries and world leaders who appear to be snoozing in public.

As Chinese President Xi Jinping spoke at a banquet in London on Wednesday, October 21 during his state visit to the UK, nearby attendees -- including Britain's Prince Andrew -- could be seen nodding off.

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Photos:Power napping: Leaders and VIPs dozing off

Supreme Court Justice Ruth Bader Ginsburg (C) fell asleep during Barack Obama's State of the Union speech in January 2015. It wasn't the first time, she says. The reason? "I was not 100% sober," Ginsburg said, blaming fellow Justice Anthony Kennedy for bringing a bottle of red wine to their pre-speech dinner.

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Photos:Power napping: Leaders and VIPs dozing off

It's one thing to fall asleep at work, quite another to snooze in front of the President. But that's what former Obama economic adviser Larry Summers appeared to be doing during this press conference in April 2009 at the White House.

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Photos:Power napping: Leaders and VIPs dozing off

Pope Benedict XVI (C), 83 at the time, falls asleep during the celebration of a Pontifical Mass on the Granaries in April 2010 in Floriana.

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Photos:Power napping: Leaders and VIPs dozing off

Then-British Prime Minister Gordon Brown (L) "rests his eyes" during a U.N. Security Council meeting in New York in April 2008.

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Photos:Power napping: Leaders and VIPs dozing off

Former Italian Prime Minister Silvio Berlusconi (C) takes a nap during a military parade to mark the the 150th anniversary of Italian unification in Rome in June 2011.

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Photos:Power napping: Leaders and VIPs dozing off

Berlusconi also found time to catch a few winks during the opening session at the Arab Summit in Libya in March 2010.

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Photos:Power napping: Leaders and VIPs dozing off

It seems there were few places that the former Italian Premier didn't see as potential nap spots. Here, Berlusconi rests his heavy eyelids at a press conference in Jerusalem in January 2009.

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Photos:Power napping: Leaders and VIPs dozing off

Japanese Prime Minister Shinzo Abe (L) and Finance Minister Taro Aso "listen" to a question from an opposition lawmaker during a budget session at the National Diet in Tokyo in February 2013.

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Photos:Power napping: Leaders and VIPs dozing off

German Chancellor Angela Merkel attends the opening (with her eyes closed) of the 7th Asia-Europe Meeting in Beijing in October 2008.

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Photos:Power napping: Leaders and VIPs dozing off

Former Cuban president Fidel Castro takes a nap during the final session of the 6th Cuban Communist Party Congress in April 2011 in Havana.

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Photos:Power napping: Leaders and VIPs dozing off

Austrian President Heinz Fischer conserves his energy during a commemoration ceremony against violence and racism in Parliament in May 2012.

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Photos:Power napping: Leaders and VIPs dozing off

Alberto Fujimori, the former president of Peru, appeared to nod off at a hearing during his trial over alleged human rights violations in Lima in May 2008.

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Story highlights

Researchers study sleep patterns of preindustrial societies

Nearly no one suffered from insomnia

(CNN)Our hunter-gatherer ancestors must have gotten more sleep than you. Before modern stresses and schedules and binge-watching "House of Cards," humans were certainly getting at least eight hours of solid deep cave sleep, right? A group of scientists studying the history of human sleep patterns says dream on.

Of course, these scientists didn't have time machines to peek in on our ancestors, so they did the next best thing to try to understand what "natural" sleep is: They studied the sleep patterns of three current preindustrial societies in Africa and Bolivia.

In other words, they found 94 people to observe who don't have the distractions of electric lighting, smartphones, Netflix and all the other trappings of modern life on which we blame our lack of sleep. The study ran in the latest edition of Current Biology.

What these scientists found was that despite their geographic and cultural differences, there was a pattern among all three groups: They were relatively healthy and they got only 6.4 hours of sleep on average a day (ranging from 5.7 to 7.1 hours per night), sleeping another hour more in the winter.

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The Hadza, who live in northern Tanzania; the Tsimane, who live in Bolivia; and the San, who live in Namibia, helped these scientists dispel a few other notions people have about idyllic premodern sleeping. These peoples nearly never nap. They don't set a sleep schedule around when it's light out. Typically, they went to sleep three hours and 20 minutes after sunset and woke before sunrise. And they slept through the night.

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The result of these sleep patterns: Nearly no one suffered from insomnia. In none of their languages is there even a word for insomnia. Most slept outside or in moderate huts.

By contrast, Americans -- even with all our modern conveniences such as adjustable beds, white-noise machines and zillion thread-count sheets -- say we really stink at sleeping.

An estimated 48% of Americans report insomnia occasionally; 22% say they have insomnia every night or almost every night. An inability to sleep is not just annoying, it's dangerous and is tied to all sorts of health issues such as obesity, diabetes, depression and cardiovascular disease. It limits our mental and physical abilities overall.

In contrast, these peoples were generally healthy. They had fewer problems with high blood pressure and obesity and were physically fit. And before you say it is because of all the exercise they get hunting and gathering, previous studies have shown that their daily energy expenditure is similar to Americans'.

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What's the difference?

It may be about sleep quality. Certainly, more research needs to be done, but Jerome Siegel, one of the authors of the study, thinks what this research can do is take some of the pressure off people who feel like they are failing to get the prescribed amount of hours that public health agencies tell them they need.

"I do think people are tired and that is a real problem," Siegel said. He is the past president of the Sleep Research Society and for 40 years has run a sleep research lab in Los Angeles. "I think that some people come in looking for help who are anxious, not because they are not rested but because they aren't hitting some prescribed number of hours or they think that we are all sleeping much less than our ancestors, and that is actually what is a fairly harmful idea."

Harmful, he say,s because when doctors hear this, they'll give patients a sleeping pill prescription when they may not need one. Pills, he said, may help you get to sleep faster, but they don't add to the length of your sleep.

Not that length matters as much as quality of sleep; it's better to feel rested rather than count the hours. And if you want to increase your likelihood of feeling rested, follow the usual sleep doctor suggestions: exercise, maintain a healthy weight, reduce your caffeine and alcohol intake, and wake up at a consistent time.

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The other big takeaway from the study, Siegel said, was that it wasn't light that regulated a sleep pattern, it was the daily cycle of temperature change. With modern insulated buildings, that is a little difficult unless you leave a window open.

"Yes, turn off the lights, that is important for sleep, but also, you can find a way to moderate the temperature in your bedroom," Siegel said. "Under natural conditions, the temperature is not just lower at night, it is falling throughout this period."

More research will need to be done. This is a study among only 94 people, but Siegel said the results are intriguing: "These people are quite healthy, so there certainly are lessons here."